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Notwithstanding many insightful observations, the electrocardiogram (ECG) arguably ignited the big bang in our understanding of cardiac arrhythmias. Using ECG recording and deductive reasoning, our teachers and predecessors classified the bradycardias and tachycardias and proposed many mechanisms, subsequently proven to be correct.
In a case report published in 1984 in the New England Journal of Medicine, Figure 1 was an electrocardiogram that showed sinus bradycardia with a short PR interval and prominent delta waves, with a pattern of preexcitation typical of a posteroseptal accessory pathway (PSAP).1
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